2026/05/14 by O. Fabelo, Óscar Fabelo, Laura Cañadillas‐Delgado +8
Materials Science · #Luminescence Properties of Advanced Materials #Thermal Expansion and Ionic Conductivity #Thermal and Kinetic Analysis #cond-mat.mtrl-sci
paper · pdf · doi:10.1107/s1600576726005297
openalex publication_date 2026/07/24 · openalex created_date 2026/07/25 · openalex updated_date 2026/07/26
The thermal expansion of natural FeWO 4 (ferberite) and synthetic FeWO 4 :Fe 2 WO 6 (7:1) was investigated over the 2–1123 K temperature range, combining single-crystal and powder X-ray diffraction together with neutron powder diffraction. High-precision lattice parameters were obtained for both samples. The temperature dependence of the unit-cell volume was analyzed using physically based thermodynamic models, including the Kroll and Berman approaches as implemented in EoSFit7-GUI . All datasets are well reproduced within their respective temperature intervals. However, significant differences are observed between the behavior of ferberite and FeWO 4 :Fe 2 WO 6 , which has a ∼40% smaller thermal expansion coefficient and a reduced reference volume. The possible origins of these differences, including microstructural and phase-coexistence effects, are discussed. The results provide a comprehensive description of the thermal expansion behavior of FeWO 4 across a wide temperature range.